Interim status report of continuing program to reduce perceived noise levels (PNL's) on ground below takeoff and landing approach paths of turbofan-powered commercial transports; program is directed principally toward development of fan-inlet and exhaust ducts incorporating acoustically absorptive linings; ground and flight tests have been performed on experimental design evolved by incorporating linings within basic "short" fan-discharge duct design of transport aircraft; results obtained show that improved lining designs are needed to provide acceptable service life; summaries of experimental and analytical studies conducted concurrent with design, fabrication, and testing of experimental ducts are also presented.
Turbofan-engine noise suppression
J Aircraft
Journal of Aircraft ; 5 , n 3
1968
6 pages
Aufsatz (Zeitschrift)
Englisch
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Turbofan-engine noise suppression
AIAA | 1967
|Turbofan-engine noise suppression.
AIAA | 1968
|Turbofan-engine noise suppression
AIAA | 1966
|Turbofan-engine noise suppression.
NTRS | 1967
|Turbofan-engine noise suppression.
NTRS | 1968
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